File d26f500ce30592313051e5c2f96b90cfd285791b.patch of Package gkrellm
From d26f500ce30592313051e5c2f96b90cfd285791b Mon Sep 17 00:00:00 2001
From: Stefan Gehn <stefan@srcbox.net>
Date: Sat, 3 Jan 2026 11:34:20 +0100
Subject: [PATCH] Optionally use libsystemd to read user count
Newer Linux systems do not write a utmp file anymore. Add a user count
based on systemd login sessions fetched via libsystemd when that
library is found and systemd support has not been disabled via the
'systemd' Meson option.
This fix/feature requires building with Meson.
Fixes #88
---
CHANGELOG.md | 1 +
meson.build | 9 ++++++++-
meson.options | 5 +++--
src/sysdeps/linux.c | 31 +++++++++++++++++++++++++++++++
4 files changed, 43 insertions(+), 3 deletions(-)
Index: b/CHANGELOG.md
===================================================================
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
# GKrellM Changelog
+### Fixed
+
+- Linux: Fix user count on Linux distros that have disabled utmp writing but use systemd/logind. Only supported when building with Meson.
+
## [2.5.0](https://git.srcbox.net/gkrellm/gkrellm/releases/tag/gkrellm-2.5.0) - 2025-12-14
- Add Meson build rules covering FreeBSD, Linux, macOS as well as Windows so
Index: b/meson.build
===================================================================
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2025 Stefan Gehn <stefan+gkrellm@srcbox.net>
+# SPDX-FileCopyrightText: 2025-2026 Stefan Gehn <stefan+gkrellm@srcbox.net>
# SPDX-License-Identifier: CC0-1.0
project(
@@ -51,6 +51,12 @@ if intl_dep.found()
project_cflags += '-DENABLE_NLS'
endif
+systemd_opt = get_option('systemd').disable_auto_if(host_machine.system() != 'linux')
+libsystemd_dep = dependency('libsystemd', required: systemd_opt)
+if libsystemd_dep.found()
+ project_cflags += '-DHAVE_LIBSYSTEMD'
+endif
+
project_cflags_check = [
'-Wformat-security',
'-Wformat-y2k',
@@ -70,6 +76,7 @@ common_deps = [
gthread_dep,
intl_dep,
lmsensors_dep,
+ libsystemd_dep,
]
# linker args shared between gkrellmd and gkrellm
Index: b/meson.options
===================================================================
--- a/meson.options
+++ b/meson.options
@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2025 Stefan Gehn <stefan+gkrellm@srcbox.net>
+# SPDX-FileCopyrightText: 2025-2026 Stefan Gehn <stefan+gkrellm@srcbox.net>
# SPDX-License-Identifier: CC0-1.0
option(
@@ -55,8 +55,9 @@ option(
'systemd',
type: 'feature',
value: 'auto',
- description: 'enable gkrellmd systemd service file (Linux only).',
+ description: 'enable gkrellmd systemd service file and logind user count (Linux only).',
)
+
option(
'systemd-unit-dir',
type: 'string',
Index: b/src/sysdeps/linux.c
===================================================================
--- a/src/sysdeps/linux.c
+++ b/src/sysdeps/linux.c
@@ -41,6 +41,9 @@
#include <inttypes.h>
+#if defined(HAVE_LIBSYSTEMD)
+#include <systemd/sd-login.h>
+#endif
static gboolean need_locale_fix,
have_sysfs,
@@ -664,6 +667,33 @@ gkrellm_sys_proc_read_data(void)
void
gkrellm_sys_proc_read_users(void)
{
+#if defined(HAVE_LIBSYSTEMD)
+ char **sessions = NULL;
+ const int sessions_count = sd_get_sessions(&sessions);
+ if (sessions_count < 0) {
+ return;
+ }
+
+ int users_count = 0;
+ for (int i = 0; i < sessions_count; ++i)
+ {
+ char *session_class = NULL;
+ if (sd_session_get_class(sessions[i], &session_class) < 0)
+ continue;
+
+ // only count actual users, not login managers or others
+ if (strcmp(session_class, "user") == 0)
+ ++users_count;
+
+ free(session_class);
+ }
+
+ for (int i = 0; i < sessions_count; ++i)
+ free(sessions[i]);
+ free(sessions);
+
+ gkrellm_proc_assign_users(users_count);
+#else // read from utmp
struct utmp *ut;
struct stat s;
static time_t utmp_mtime;
@@ -679,6 +709,7 @@ gkrellm_sys_proc_read_users(void)
utmp_mtime = s.st_mtime;
gkrellm_proc_assign_users(n_users);
}
+#endif
}
gboolean
